We provide an experimental evidence of transient instabilities (TIs) in a terahertz (THz)
quantum cascade laser (QCL) under optical feedback, in contrast to the widely accepted …

Semiconductor superlattices are proven nanomaterials for THz nonlinear optics by means of
high order harmonic generation. Seminal approaches leading to a perfectly antisymmetric …

ZnO based heterostructures have recently received increased research attention, related to
the development of room temperature THz/MiR semiconductor devices. The potential for …

The topic of external optical feedback in quantum-cascade lasers is relevant for stability and
beam-properties considerations. Albeit less sensitive to external optical feedback than other …

Recent studies have predicted a strong increase in high harmonic emission in unbiased
semiconductor superlattices due to asymmetric current flow. In parallel, an external static …

ZnO-based heterostructures are up-and-coming candidates for terahertz (THz)
optoelectronic devices, largely owing to their innate material attributes. The significant ZnO …

We start from the Maxwell-Bloch equations that govern the dynamics of Fabry-Perot lasers
and, considering a doubled cavity, generalize our traveling wave formalism to the case in …

Coherent multimode instabilities are responsible for several phenomena of recent interest in
semiconductor lasers, such as the generation of frequency combs and ultrashort pulses …

Passive mode-locking in quantum cascade lasers (QCLs) remains one of the huge
challenges because of the fast relaxation time of the excited carriers which is typically in the …

量子级联激光器(Quantum Cascade Laser, QCL) 是依赖电子在量子阱子带间跃迁辐射出光子
而发生激射的单极型半导体激光器. 大量的理论与实验研究已经证明轻微的外部扰动(如光反馈 …